There are many different systems involved in when we ...

There are many different systems involved in when we exercise, the three main ones are the Respiratory system which is involved in breathing the circulatory system which is about circulation of blood around the body and finally the muscular system and finally the Muscular system which is about how we move.

The system that helps you breathe when you exercise is the respiratory system. The Respiratory system helps us to get the oxygen into our body and get rid of carbon dioxide.

BREATHING The respiratory system is an important process. The first thing that happens in the respiratory system is when we breathe in oxygen and breathe out carbon dioxide. Your body needs oxygen to stay alive. Your body automatically breathes until you die.

After we breathe in, the air travels down a windpipe called the Trachea. The trachea is connected from the nose and mouth to the lungs. Cilia tiny hairs in the trachea catch mucus and dirt it also moves gently while you are breathing.

A muscle that helps us breathe is the diaphragm. The diaphragm is located under the lungs; it is a dome shaped muscle. When we breathe in the diaphragm contracts and when we breathe out it relaxes, the diaphragm expands the lungs to allow more oxygen in the lungs deflate and push carbon dioxide out.

LUNGS

The next thing in your respiratory system is the lungs. The lungs are located in your chest behind your rib cage which protects your lungs. The rib cage protects the lungs by going over it. The lungs rest on top of the diaphragm.

The lungs are pink and squishy like a sponge; the left lung is smaller than the right, which makes room for the heart.

When the trachea splits into it is called the bronchus. The bronchus is the main tube to the lungs, and the plural for bronchus is called the

bronchi. The bronchus allows air to enter each lung.

The bronchus is connected to the bronchioles' which are tiny tubes. The bronchioles' are the size of a hair. There are 30,000 bronchioles' in each lung in each lung and they keep on getting smaller and smaller which allows oxygen to pass to and your alveoli. Another part of your lungs is the alveoli. The alveoli are tiny clumps of air sacks and there are 600,000,000 alveoli in the lungs. Alveoli can be found at the end of each bronchiole. The alveoli fill up with air when you breathe in, which allows oxygen to pass through your blood. They are surrounded by tiny blood vessels called capillaries.

BLOOD

The next part that is important to the respiratory system is the blood; capillaries which are tiny blood vessels are small enough for blood cells to be in single file. First the oxygen is transferred onto the blood cells. Next the blood takes the oxygen around the body. Finally carbon dioxide is transferred into the lungs to breathe out.

EXERCISE

When we are exercising our respiratory system accelerates this is because our body needs more oxygen. Our body breathes faster and deeper and uses 3 litres or more of air a minute.

The next system involved in exercise is the circulatory system. The circulatory system related to the heart which pumps blood around the body.

HEART When we exercise we use an organ called the heart. The heart is to the left, middle of your chest, it is close to all your important organs. The heart is the size of its of its owners clenched fist . The heart is a muscle called the myocardium that pumps blood around the body and is like a hollow bag. The heart's fibres have a special pattern , it is different to all the other r muscle fibres makes it easier to pump and squeeze .

The heart has four chambers. The right side of the heart has an atrium , the atrium receives deoxygenated blood from the body. The right side also includes the tricuspid valve, the tricuspid valve is located between your atrium and ventricle. It allows blood into the ventricle from the atrium. The right side of the heart pumps blood tho the pulmonary artery.

The left side of the heart also has an atrium which receives blood from the lungs. The bicuspid valve is the valve that is between the atrium and the ventricle. The left side pumps blood to the aorta, then is sent around the body.

Another part of the heart is the nerves. The sympathic nerves which receives impulses from the brain and the heart to beat. It also tells the heart's rate and force to increase when needed. The next is the parasympathetic nerves, these nerves tells the heart to slow down when needed, it is like your braking system. The nerves are connected to our nervous system called the autonomic nervous system, this works automatically.

3 CIRCULATION

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